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net: ipmr: rearrange and cleanup setsockopt
[deliverable/linux.git] / net / ipv4 / devinet.c
CommitLineData
1da177e4
LT		 1/*
2 * NET3 IP device support routines.
3 *
1da177e4
LT		 4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Derived from the IP parts of dev.c 1.0.19
02c30a84 10 * Authors: Ross Biro
1da177e4
LT		 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
15 * Alan Cox, <gw4pts@gw4pts.ampr.org>
16 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
17 *
18 * Changes:
19 * Alexey Kuznetsov: pa_* fields are replaced with ifaddr
20 * lists.
21 * Cyrus Durgin: updated for kmod
22 * Matthias Andree: in devinet_ioctl, compare label and
23 * address (4.4BSD alias style support),
24 * fall back to comparing just the label
25 * if no match found.
26 */
27
1da177e4
LT		 28
29#include <asm/uaccess.h>
1da177e4 30#include <linux/bitops.h>
4fc268d2 31#include <linux/capability.h>
1da177e4
LT		 32#include <linux/module.h>
33#include <linux/types.h>
34#include <linux/kernel.h>
1da177e4
LT		 35#include <linux/string.h>
36#include <linux/mm.h>
37#include <linux/socket.h>
38#include <linux/sockios.h>
39#include <linux/in.h>
40#include <linux/errno.h>
41#include <linux/interrupt.h>
1823730f 42#include <linux/if_addr.h>
1da177e4
LT		 43#include <linux/if_ether.h>
44#include <linux/inet.h>
45#include <linux/netdevice.h>
46#include <linux/etherdevice.h>
47#include <linux/skbuff.h>
1da177e4
LT		 48#include <linux/init.h>
49#include <linux/notifier.h>
50#include <linux/inetdevice.h>
51#include <linux/igmp.h>
5a0e3ad6 52#include <linux/slab.h>
fd23c3b3 53#include <linux/hash.h>
1da177e4
LT		 54#ifdef CONFIG_SYSCTL
55#include <linux/sysctl.h>
56#endif
57#include <linux/kmod.h>
edc9e748 58#include <linux/netconf.h>
1da177e4 59
14c85021 60#include <net/arp.h>
1da177e4
LT		 61#include <net/ip.h>
62#include <net/route.h>
63#include <net/ip_fib.h>
63f3444f 64#include <net/rtnetlink.h>
752d14dc 65#include <net/net_namespace.h>
5c766d64 66#include <net/addrconf.h>
1da177e4 67
406b6f97
DM		 68#include "fib_lookup.h"
69
0027ba84 70static struct ipv4_devconf ipv4_devconf = {
42f811b8 71 .data = {
02291680
EB		 72 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
73 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
74 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
75 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
2690048c
WM		 76 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
77 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
42f811b8 78 },
1da177e4
LT		 79};
80
81static struct ipv4_devconf ipv4_devconf_dflt = {
42f811b8 82 .data = {
02291680
EB		 83 [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
84 [IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
85 [IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
86 [IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
87 [IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
2690048c
WM		 88 [IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
89 [IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] = 1000 /*ms*/,
42f811b8 90 },
1da177e4
LT		 91};
92
9355bbd6
PE		 93#define IPV4_DEVCONF_DFLT(net, attr) \
94 IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
42f811b8 95
ef7c79ed 96static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
5c753978
TG		 97 [IFA_LOCAL] = { .type = NLA_U32 },
98 [IFA_ADDRESS] = { .type = NLA_U32 },
99 [IFA_BROADCAST] = { .type = NLA_U32 },
5176f91e 100 [IFA_LABEL] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
5c766d64 101 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
ad6c8135 102 [IFA_FLAGS] = { .type = NLA_U32 },
5c753978
TG		 103};
104
40384999
ED		 105#define IN4_ADDR_HSIZE_SHIFT 8
106#define IN4_ADDR_HSIZE (1U << IN4_ADDR_HSIZE_SHIFT)
107
fd23c3b3 108static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
fd23c3b3 109
6eada011 110static u32 inet_addr_hash(const struct net *net, __be32 addr)
fd23c3b3 111{
40384999 112 u32 val = (__force u32) addr ^ net_hash_mix(net);
fd23c3b3 113
40384999 114 return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
fd23c3b3
DM		 115}
116
117static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
118{
40384999 119 u32 hash = inet_addr_hash(net, ifa->ifa_local);
fd23c3b3 120
32a4be48 121 ASSERT_RTNL();
fd23c3b3 122 hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
fd23c3b3
DM		 123}
124
125static void inet_hash_remove(struct in_ifaddr *ifa)
126{
32a4be48 127 ASSERT_RTNL();
fd23c3b3 128 hlist_del_init_rcu(&ifa->hash);
fd23c3b3
DM		 129}
130
9435eb1c
DM		 131/**
132 * __ip_dev_find - find the first device with a given source address.
133 * @net: the net namespace
134 * @addr: the source address
135 * @devref: if true, take a reference on the found device
136 *
137 * If a caller uses devref=false, it should be protected by RCU, or RTNL
138 */
139struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
140{
40384999 141 u32 hash = inet_addr_hash(net, addr);
9435eb1c
DM		 142 struct net_device *result = NULL;
143 struct in_ifaddr *ifa;
9435eb1c
DM		 144
145 rcu_read_lock();
b67bfe0d 146 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
e066008b 147 if (ifa->ifa_local == addr) {
40384999
ED		 148 struct net_device *dev = ifa->ifa_dev->dev;
149
150 if (!net_eq(dev_net(dev), net))
151 continue;
9435eb1c
DM		 152 result = dev;
153 break;
154 }
155 }
406b6f97
DM		 156 if (!result) {
157 struct flowi4 fl4 = { .daddr = addr };
158 struct fib_result res = { 0 };
159 struct fib_table *local;
160
161 /* Fallback to FIB local table so that communication
162 * over loopback subnets work.
163 */
164 local = fib_get_table(net, RT_TABLE_LOCAL);
165 if (local &&
166 !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
167 res.type == RTN_LOCAL)
168 result = FIB_RES_DEV(res);
169 }
9435eb1c
DM		 170 if (result && devref)
171 dev_hold(result);
172 rcu_read_unlock();
173 return result;
174}
175EXPORT_SYMBOL(__ip_dev_find);
176
d6062cbb 177static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
1da177e4 178
e041c683 179static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
1da177e4
LT		 180static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
181 int destroy);
182#ifdef CONFIG_SYSCTL
20e61da7 183static int devinet_sysctl_register(struct in_device *idev);
51602b2a
PE		 184static void devinet_sysctl_unregister(struct in_device *idev);
185#else
20e61da7 186static int devinet_sysctl_register(struct in_device *idev)
51602b2a 187{
20e61da7 188 return 0;
51602b2a 189}
40384999 190static void devinet_sysctl_unregister(struct in_device *idev)
51602b2a
PE		 191{
192}
1da177e4
LT		 193#endif
194
195/* Locks all the inet devices. */
196
197static struct in_ifaddr *inet_alloc_ifa(void)
198{
93adcc80 199 return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
1da177e4
LT		 200}
201
202static void inet_rcu_free_ifa(struct rcu_head *head)
203{
204 struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
205 if (ifa->ifa_dev)
206 in_dev_put(ifa->ifa_dev);
207 kfree(ifa);
208}
209
40384999 210static void inet_free_ifa(struct in_ifaddr *ifa)
1da177e4
LT		 211{
212 call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
213}
214
215void in_dev_finish_destroy(struct in_device *idev)
216{
217 struct net_device *dev = idev->dev;
218
547b792c
IJ		 219 WARN_ON(idev->ifa_list);
220 WARN_ON(idev->mc_list);
e9897071 221 kfree(rcu_dereference_protected(idev->mc_hash, 1));
1da177e4 222#ifdef NET_REFCNT_DEBUG
91df42be 223 pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
1da177e4
LT		 224#endif
225 dev_put(dev);
226 if (!idev->dead)
9f9354b9
ED		 227 pr_err("Freeing alive in_device %p\n", idev);
228 else
1da177e4 229 kfree(idev);
1da177e4 230}
9f9354b9 231EXPORT_SYMBOL(in_dev_finish_destroy);
1da177e4 232
71e27da9 233static struct in_device *inetdev_init(struct net_device *dev)
1da177e4
LT		 234{
235 struct in_device *in_dev;
20e61da7 236 int err = -ENOMEM;
1da177e4
LT		 237
238 ASSERT_RTNL();
239
0da974f4 240 in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
1da177e4
LT		 241 if (!in_dev)
242 goto out;
c346dca1 243 memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
9355bbd6 244 sizeof(in_dev->cnf));
1da177e4
LT		 245 in_dev->cnf.sysctl = NULL;
246 in_dev->dev = dev;
9f9354b9
ED		 247 in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
248 if (!in_dev->arp_parms)
1da177e4 249 goto out_kfree;
0187bdfb
BH		 250 if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
251 dev_disable_lro(dev);
1da177e4
LT		 252 /* Reference in_dev->dev */
253 dev_hold(dev);
30c4cf57 254 /* Account for reference dev->ip_ptr (below) */
1da177e4 255 in_dev_hold(in_dev);
1da177e4 256
20e61da7
WC		 257 err = devinet_sysctl_register(in_dev);
258 if (err) {
259 in_dev->dead = 1;
260 in_dev_put(in_dev);
261 in_dev = NULL;
262 goto out;
263 }
1da177e4
LT		 264 ip_mc_init_dev(in_dev);
265 if (dev->flags & IFF_UP)
266 ip_mc_up(in_dev);
483479ec 267
30c4cf57 268 /* we can receive as soon as ip_ptr is set -- do this last */
cf778b00 269 rcu_assign_pointer(dev->ip_ptr, in_dev);
483479ec 270out:
20e61da7 271 return in_dev ?: ERR_PTR(err);
1da177e4
LT		 272out_kfree:
273 kfree(in_dev);
274 in_dev = NULL;
275 goto out;
276}
277
278static void in_dev_rcu_put(struct rcu_head *head)
279{
280 struct in_device *idev = container_of(head, struct in_device, rcu_head);
281 in_dev_put(idev);
282}
283
284static void inetdev_destroy(struct in_device *in_dev)
285{
286 struct in_ifaddr *ifa;
287 struct net_device *dev;
288
289 ASSERT_RTNL();
290
291 dev = in_dev->dev;
1da177e4
LT		 292
293 in_dev->dead = 1;
294
295 ip_mc_destroy_dev(in_dev);
296
297 while ((ifa = in_dev->ifa_list) != NULL) {
298 inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
299 inet_free_ifa(ifa);
300 }
301
a9b3cd7f 302 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4 303
51602b2a 304 devinet_sysctl_unregister(in_dev);
1da177e4
LT		 305 neigh_parms_release(&arp_tbl, in_dev->arp_parms);
306 arp_ifdown(dev);
307
308 call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
309}
310
ff428d72 311int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
1da177e4
LT		 312{
313 rcu_read_lock();
314 for_primary_ifa(in_dev) {
315 if (inet_ifa_match(a, ifa)) {
316 if (!b || inet_ifa_match(b, ifa)) {
317 rcu_read_unlock();
318 return 1;
319 }
320 }
321 } endfor_ifa(in_dev);
322 rcu_read_unlock();
323 return 0;
324}
325
d6062cbb 326static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
15e47304 327 int destroy, struct nlmsghdr *nlh, u32 portid)
1da177e4 328{
8f937c60 329 struct in_ifaddr *promote = NULL;
0ff60a45
JHS		 330 struct in_ifaddr *ifa, *ifa1 = *ifap;
331 struct in_ifaddr *last_prim = in_dev->ifa_list;
332 struct in_ifaddr *prev_prom = NULL;
333 int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
1da177e4
LT		 334
335 ASSERT_RTNL();
336
e905a9ed 337 /* 1. Deleting primary ifaddr forces deletion all secondaries
8f937c60
HW		 338 * unless alias promotion is set
339 **/
1da177e4
LT		 340
341 if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
1da177e4
LT		 342 struct in_ifaddr **ifap1 = &ifa1->ifa_next;
343
344 while ((ifa = *ifap1) != NULL) {
e905a9ed 345 if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
0ff60a45
JHS		 346 ifa1->ifa_scope <= ifa->ifa_scope)
347 last_prim = ifa;
348
1da177e4
LT		 349 if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
350 ifa1->ifa_mask != ifa->ifa_mask ||
351 !inet_ifa_match(ifa1->ifa_address, ifa)) {
352 ifap1 = &ifa->ifa_next;
0ff60a45 353 prev_prom = ifa;
1da177e4
LT		 354 continue;
355 }
356
0ff60a45 357 if (!do_promote) {
fd23c3b3 358 inet_hash_remove(ifa);
8f937c60 359 *ifap1 = ifa->ifa_next;
1da177e4 360
15e47304 361 rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
e041c683
AS		 362 blocking_notifier_call_chain(&inetaddr_chain,
363 NETDEV_DOWN, ifa);
8f937c60
HW		 364 inet_free_ifa(ifa);
365 } else {
366 promote = ifa;
367 break;
368 }
1da177e4
LT		 369 }
370 }
371
2d230e2b
JA		 372 /* On promotion all secondaries from subnet are changing
373 * the primary IP, we must remove all their routes silently
374 * and later to add them back with new prefsrc. Do this
375 * while all addresses are on the device list.
376 */
377 for (ifa = promote; ifa; ifa = ifa->ifa_next) {
378 if (ifa1->ifa_mask == ifa->ifa_mask &&
379 inet_ifa_match(ifa1->ifa_address, ifa))
380 fib_del_ifaddr(ifa, ifa1);
381 }
382
1da177e4
LT		 383 /* 2. Unlink it */
384
385 *ifap = ifa1->ifa_next;
fd23c3b3 386 inet_hash_remove(ifa1);
1da177e4
LT		 387
388 /* 3. Announce address deletion */
389
390 /* Send message first, then call notifier.
391 At first sight, FIB update triggered by notifier
392 will refer to already deleted ifaddr, that could confuse
393 netlink listeners. It is not true: look, gated sees
394 that route deleted and if it still thinks that ifaddr
395 is valid, it will try to restore deleted routes... Grr.
396 So that, this order is correct.
397 */
15e47304 398 rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
e041c683 399 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
1da177e4 400
0ff60a45 401 if (promote) {
04024b93 402 struct in_ifaddr *next_sec = promote->ifa_next;
0ff60a45
JHS		 403
404 if (prev_prom) {
405 prev_prom->ifa_next = promote->ifa_next;
406 promote->ifa_next = last_prim->ifa_next;
407 last_prim->ifa_next = promote;
408 }
8f937c60 409
8f937c60 410 promote->ifa_flags &= ~IFA_F_SECONDARY;
15e47304 411 rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
e041c683
AS		 412 blocking_notifier_call_chain(&inetaddr_chain,
413 NETDEV_UP, promote);
04024b93 414 for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
0ff60a45
JHS		 415 if (ifa1->ifa_mask != ifa->ifa_mask ||
416 !inet_ifa_match(ifa1->ifa_address, ifa))
417 continue;
418 fib_add_ifaddr(ifa);
419 }
420
421 }
6363097c 422 if (destroy)
0ff60a45 423 inet_free_ifa(ifa1);
1da177e4
LT		 424}
425
d6062cbb
TG		 426static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
427 int destroy)
428{
429 __inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
430}
431
5c766d64
JP		 432static void check_lifetime(struct work_struct *work);
433
434static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
435
d6062cbb 436static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 437 u32 portid)
1da177e4
LT		 438{
439 struct in_device *in_dev = ifa->ifa_dev;
440 struct in_ifaddr *ifa1, **ifap, **last_primary;
441
442 ASSERT_RTNL();
443
444 if (!ifa->ifa_local) {
445 inet_free_ifa(ifa);
446 return 0;
447 }
448
449 ifa->ifa_flags &= ~IFA_F_SECONDARY;
450 last_primary = &in_dev->ifa_list;
451
452 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
453 ifap = &ifa1->ifa_next) {
454 if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
455 ifa->ifa_scope <= ifa1->ifa_scope)
456 last_primary = &ifa1->ifa_next;
457 if (ifa1->ifa_mask == ifa->ifa_mask &&
458 inet_ifa_match(ifa1->ifa_address, ifa)) {
459 if (ifa1->ifa_local == ifa->ifa_local) {
460 inet_free_ifa(ifa);
461 return -EEXIST;
462 }
463 if (ifa1->ifa_scope != ifa->ifa_scope) {
464 inet_free_ifa(ifa);
465 return -EINVAL;
466 }
467 ifa->ifa_flags |= IFA_F_SECONDARY;
468 }
469 }
470
471 if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
63862b5b 472 prandom_seed((__force u32) ifa->ifa_local);
1da177e4
LT		 473 ifap = last_primary;
474 }
475
476 ifa->ifa_next = *ifap;
477 *ifap = ifa;
478
fd23c3b3
DM		 479 inet_hash_insert(dev_net(in_dev->dev), ifa);
480
5c766d64 481 cancel_delayed_work(&check_lifetime_work);
906e073f 482 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
5c766d64 483
1da177e4
LT		 484 /* Send message first, then call notifier.
485 Notifier will trigger FIB update, so that
486 listeners of netlink will know about new ifaddr */
15e47304 487 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
e041c683 488 blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
1da177e4
LT		 489
490 return 0;
491}
492
d6062cbb
TG		 493static int inet_insert_ifa(struct in_ifaddr *ifa)
494{
495 return __inet_insert_ifa(ifa, NULL, 0);
496}
497
1da177e4
LT		 498static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
499{
e5ed6399 500 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 501
502 ASSERT_RTNL();
503
504 if (!in_dev) {
71e27da9
HX		 505 inet_free_ifa(ifa);
506 return -ENOBUFS;
1da177e4 507 }
71e27da9 508 ipv4_devconf_setall(in_dev);
1d4c8c29 509 neigh_parms_data_state_setall(in_dev->arp_parms);
1da177e4 510 if (ifa->ifa_dev != in_dev) {
547b792c 511 WARN_ON(ifa->ifa_dev);
1da177e4
LT		 512 in_dev_hold(in_dev);
513 ifa->ifa_dev = in_dev;
514 }
f97c1e0c 515 if (ipv4_is_loopback(ifa->ifa_local))
1da177e4
LT		 516 ifa->ifa_scope = RT_SCOPE_HOST;
517 return inet_insert_ifa(ifa);
518}
519
8723e1b4
ED		 520/* Caller must hold RCU or RTNL :
521 * We dont take a reference on found in_device
522 */
7fee0ca2 523struct in_device *inetdev_by_index(struct net *net, int ifindex)
1da177e4
LT		 524{
525 struct net_device *dev;
526 struct in_device *in_dev = NULL;
c148fc2e
ED		 527
528 rcu_read_lock();
529 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4 530 if (dev)
8723e1b4 531 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
c148fc2e 532 rcu_read_unlock();
1da177e4
LT		 533 return in_dev;
534}
9f9354b9 535EXPORT_SYMBOL(inetdev_by_index);
1da177e4
LT		 536
537/* Called only from RTNL semaphored context. No locks. */
538
60cad5da
AV		 539struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
540 __be32 mask)
1da177e4
LT		 541{
542 ASSERT_RTNL();
543
544 for_primary_ifa(in_dev) {
545 if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
546 return ifa;
547 } endfor_ifa(in_dev);
548 return NULL;
549}
550
93a714d6
MC		 551static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa)
552{
553 struct ip_mreqn mreq = {
554 .imr_multiaddr.s_addr = ifa->ifa_address,
555 .imr_ifindex = ifa->ifa_dev->dev->ifindex,
556 };
557 int ret;
558
559 ASSERT_RTNL();
560
561 lock_sock(sk);
562 if (join)
54ff9ef3 563 ret = ip_mc_join_group(sk, &mreq);
93a714d6 564 else
54ff9ef3 565 ret = ip_mc_leave_group(sk, &mreq);
93a714d6
MC		 566 release_sock(sk);
567
568 return ret;
569}
570
661d2967 571static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
1da177e4 572{
3b1e0a65 573 struct net *net = sock_net(skb->sk);
dfdd5fd4 574 struct nlattr *tb[IFA_MAX+1];
1da177e4 575 struct in_device *in_dev;
dfdd5fd4 576 struct ifaddrmsg *ifm;
1da177e4 577 struct in_ifaddr *ifa, **ifap;
dfdd5fd4 578 int err = -EINVAL;
1da177e4
LT		 579
580 ASSERT_RTNL();
581
dfdd5fd4
TG		 582 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
583 if (err < 0)
584 goto errout;
585
586 ifm = nlmsg_data(nlh);
7fee0ca2 587 in_dev = inetdev_by_index(net, ifm->ifa_index);
51456b29 588 if (!in_dev) {
dfdd5fd4
TG		 589 err = -ENODEV;
590 goto errout;
591 }
592
1da177e4
LT		 593 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
594 ifap = &ifa->ifa_next) {
dfdd5fd4 595 if (tb[IFA_LOCAL] &&
67b61f6c 596 ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
dfdd5fd4
TG		 597 continue;
598
599 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
1da177e4 600 continue;
dfdd5fd4
TG		 601
602 if (tb[IFA_ADDRESS] &&
603 (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
67b61f6c 604 !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
dfdd5fd4
TG		 605 continue;
606
93a714d6
MC		 607 if (ipv4_is_multicast(ifa->ifa_address))
608 ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa);
15e47304 609 __inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
1da177e4
LT		 610 return 0;
611 }
dfdd5fd4
TG		 612
613 err = -EADDRNOTAVAIL;
614errout:
615 return err;
1da177e4
LT		 616}
617
5c766d64
JP		 618#define INFINITY_LIFE_TIME 0xFFFFFFFF
619
620static void check_lifetime(struct work_struct *work)
621{
622 unsigned long now, next, next_sec, next_sched;
623 struct in_ifaddr *ifa;
c988d1e8 624 struct hlist_node *n;
5c766d64
JP		 625 int i;
626
627 now = jiffies;
628 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
629
5c766d64 630 for (i = 0; i < IN4_ADDR_HSIZE; i++) {
c988d1e8
JP		 631 bool change_needed = false;
632
633 rcu_read_lock();
b67bfe0d 634 hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
5c766d64
JP		 635 unsigned long age;
636
637 if (ifa->ifa_flags & IFA_F_PERMANENT)
638 continue;
639
640 /* We try to batch several events at once. */
641 age = (now - ifa->ifa_tstamp +
642 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
643
644 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
645 age >= ifa->ifa_valid_lft) {
c988d1e8 646 change_needed = true;
5c766d64
JP		 647 } else if (ifa->ifa_preferred_lft ==
648 INFINITY_LIFE_TIME) {
649 continue;
650 } else if (age >= ifa->ifa_preferred_lft) {
651 if (time_before(ifa->ifa_tstamp +
652 ifa->ifa_valid_lft * HZ, next))
653 next = ifa->ifa_tstamp +
654 ifa->ifa_valid_lft * HZ;
655
c988d1e8
JP		 656 if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
657 change_needed = true;
5c766d64
JP		 658 } else if (time_before(ifa->ifa_tstamp +
659 ifa->ifa_preferred_lft * HZ,
660 next)) {
661 next = ifa->ifa_tstamp +
662 ifa->ifa_preferred_lft * HZ;
663 }
664 }
c988d1e8
JP		 665 rcu_read_unlock();
666 if (!change_needed)
667 continue;
668 rtnl_lock();
669 hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
670 unsigned long age;
671
672 if (ifa->ifa_flags & IFA_F_PERMANENT)
673 continue;
674
675 /* We try to batch several events at once. */
676 age = (now - ifa->ifa_tstamp +
677 ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
678
679 if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
680 age >= ifa->ifa_valid_lft) {
681 struct in_ifaddr **ifap;
682
683 for (ifap = &ifa->ifa_dev->ifa_list;
684 *ifap != NULL; ifap = &(*ifap)->ifa_next) {
685 if (*ifap == ifa) {
686 inet_del_ifa(ifa->ifa_dev,
687 ifap, 1);
688 break;
689 }
690 }
691 } else if (ifa->ifa_preferred_lft !=
692 INFINITY_LIFE_TIME &&
693 age >= ifa->ifa_preferred_lft &&
694 !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
695 ifa->ifa_flags |= IFA_F_DEPRECATED;
696 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
697 }
698 }
699 rtnl_unlock();
5c766d64 700 }
5c766d64
JP		 701
702 next_sec = round_jiffies_up(next);
703 next_sched = next;
704
705 /* If rounded timeout is accurate enough, accept it. */
706 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
707 next_sched = next_sec;
708
709 now = jiffies;
710 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
711 if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
712 next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
713
906e073f 714 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
715 next_sched - now);
5c766d64
JP		 716}
717
718static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
719 __u32 prefered_lft)
720{
721 unsigned long timeout;
722
723 ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
724
725 timeout = addrconf_timeout_fixup(valid_lft, HZ);
726 if (addrconf_finite_timeout(timeout))
727 ifa->ifa_valid_lft = timeout;
728 else
729 ifa->ifa_flags |= IFA_F_PERMANENT;
730
731 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
732 if (addrconf_finite_timeout(timeout)) {
733 if (timeout == 0)
734 ifa->ifa_flags |= IFA_F_DEPRECATED;
735 ifa->ifa_preferred_lft = timeout;
736 }
737 ifa->ifa_tstamp = jiffies;
738 if (!ifa->ifa_cstamp)
739 ifa->ifa_cstamp = ifa->ifa_tstamp;
740}
741
742static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
743 __u32 *pvalid_lft, __u32 *pprefered_lft)
1da177e4 744{
5c753978
TG		 745 struct nlattr *tb[IFA_MAX+1];
746 struct in_ifaddr *ifa;
747 struct ifaddrmsg *ifm;
1da177e4
LT		 748 struct net_device *dev;
749 struct in_device *in_dev;
7b218574 750 int err;
1da177e4 751
5c753978
TG		 752 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
753 if (err < 0)
754 goto errout;
1da177e4 755
5c753978 756 ifm = nlmsg_data(nlh);
7b218574 757 err = -EINVAL;
51456b29 758 if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
5c753978 759 goto errout;
1da177e4 760
4b8aa9ab 761 dev = __dev_get_by_index(net, ifm->ifa_index);
7b218574 762 err = -ENODEV;
51456b29 763 if (!dev)
5c753978 764 goto errout;
1da177e4 765
5c753978 766 in_dev = __in_dev_get_rtnl(dev);
7b218574 767 err = -ENOBUFS;
51456b29 768 if (!in_dev)
71e27da9 769 goto errout;
1da177e4 770
5c753978 771 ifa = inet_alloc_ifa();
51456b29 772 if (!ifa)
5c753978
TG		 773 /*
774 * A potential indev allocation can be left alive, it stays
775 * assigned to its device and is destroy with it.
776 */
5c753978 777 goto errout;
5c753978 778
a4e65d36 779 ipv4_devconf_setall(in_dev);
1d4c8c29 780 neigh_parms_data_state_setall(in_dev->arp_parms);
5c753978
TG		 781 in_dev_hold(in_dev);
782
51456b29 783 if (!tb[IFA_ADDRESS])
5c753978 784 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
1da177e4 785
fd23c3b3 786 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 787 ifa->ifa_prefixlen = ifm->ifa_prefixlen;
788 ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
ad6c8135
JP		 789 ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
790 ifm->ifa_flags;
1da177e4 791 ifa->ifa_scope = ifm->ifa_scope;
5c753978
TG		 792 ifa->ifa_dev = in_dev;
793
67b61f6c
JB		 794 ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
795 ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
5c753978
TG		 796
797 if (tb[IFA_BROADCAST])
67b61f6c 798 ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
5c753978 799
5c753978
TG		 800 if (tb[IFA_LABEL])
801 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
1da177e4
LT		 802 else
803 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
804
5c766d64
JP		 805 if (tb[IFA_CACHEINFO]) {
806 struct ifa_cacheinfo *ci;
807
808 ci = nla_data(tb[IFA_CACHEINFO]);
809 if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
810 err = -EINVAL;
446266b0 811 goto errout_free;
5c766d64
JP		 812 }
813 *pvalid_lft = ci->ifa_valid;
814 *pprefered_lft = ci->ifa_prefered;
815 }
816
5c753978
TG		 817 return ifa;
818
446266b0
DB		 819errout_free:
820 inet_free_ifa(ifa);
5c753978
TG		 821errout:
822 return ERR_PTR(err);
823}
824
5c766d64
JP		 825static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
826{
827 struct in_device *in_dev = ifa->ifa_dev;
828 struct in_ifaddr *ifa1, **ifap;
829
830 if (!ifa->ifa_local)
831 return NULL;
832
833 for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
834 ifap = &ifa1->ifa_next) {
835 if (ifa1->ifa_mask == ifa->ifa_mask &&
836 inet_ifa_match(ifa1->ifa_address, ifa) &&
837 ifa1->ifa_local == ifa->ifa_local)
838 return ifa1;
839 }
840 return NULL;
841}
842
661d2967 843static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
5c753978 844{
3b1e0a65 845 struct net *net = sock_net(skb->sk);
5c753978 846 struct in_ifaddr *ifa;
5c766d64
JP		 847 struct in_ifaddr *ifa_existing;
848 __u32 valid_lft = INFINITY_LIFE_TIME;
849 __u32 prefered_lft = INFINITY_LIFE_TIME;
5c753978
TG		 850
851 ASSERT_RTNL();
852
5c766d64 853 ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
5c753978
TG		 854 if (IS_ERR(ifa))
855 return PTR_ERR(ifa);
856
5c766d64
JP		 857 ifa_existing = find_matching_ifa(ifa);
858 if (!ifa_existing) {
859 /* It would be best to check for !NLM_F_CREATE here but
614d056c 860 * userspace already relies on not having to provide this.
5c766d64
JP		 861 */
862 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
93a714d6
MC		 863 if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
864 int ret = ip_mc_config(net->ipv4.mc_autojoin_sk,
865 true, ifa);
866
867 if (ret < 0) {
868 inet_free_ifa(ifa);
869 return ret;
870 }
871 }
5c766d64
JP		 872 return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid);
873 } else {
874 inet_free_ifa(ifa);
875
876 if (nlh->nlmsg_flags & NLM_F_EXCL ||
877 !(nlh->nlmsg_flags & NLM_F_REPLACE))
878 return -EEXIST;
34e2ed34
JP		 879 ifa = ifa_existing;
880 set_ifa_lifetime(ifa, valid_lft, prefered_lft);
05a324b9 881 cancel_delayed_work(&check_lifetime_work);
906e073f 882 queue_delayed_work(system_power_efficient_wq,
883 &check_lifetime_work, 0);
34e2ed34 884 rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
5c766d64
JP		 885 }
886 return 0;
1da177e4
LT		 887}
888
889/*
890 * Determine a default network mask, based on the IP address.
891 */
892
40384999 893static int inet_abc_len(__be32 addr)
1da177e4
LT		 894{
895 int rc = -1; /* Something else, probably a multicast. */
896
f97c1e0c 897 if (ipv4_is_zeronet(addr))
e905a9ed 898 rc = 0;
1da177e4 899 else {
714e85be 900 __u32 haddr = ntohl(addr);
1da177e4 901
714e85be 902 if (IN_CLASSA(haddr))
1da177e4 903 rc = 8;
714e85be 904 else if (IN_CLASSB(haddr))
1da177e4 905 rc = 16;
714e85be 906 else if (IN_CLASSC(haddr))
1da177e4
LT		 907 rc = 24;
908 }
909
e905a9ed 910 return rc;
1da177e4
LT		 911}
912
913
e5b13cb1 914int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1da177e4
LT		 915{
916 struct ifreq ifr;
917 struct sockaddr_in sin_orig;
918 struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
919 struct in_device *in_dev;
920 struct in_ifaddr **ifap = NULL;
921 struct in_ifaddr *ifa = NULL;
922 struct net_device *dev;
923 char *colon;
924 int ret = -EFAULT;
925 int tryaddrmatch = 0;
926
927 /*
928 * Fetch the caller's info block into kernel space
929 */
930
931 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
932 goto out;
933 ifr.ifr_name[IFNAMSIZ - 1] = 0;
934
935 /* save original address for comparison */
936 memcpy(&sin_orig, sin, sizeof(*sin));
937
938 colon = strchr(ifr.ifr_name, ':');
939 if (colon)
940 *colon = 0;
941
e5b13cb1 942 dev_load(net, ifr.ifr_name);
1da177e4 943
132adf54 944 switch (cmd) {
1da177e4
LT		 945 case SIOCGIFADDR: /* Get interface address */
946 case SIOCGIFBRDADDR: /* Get the broadcast address */
947 case SIOCGIFDSTADDR: /* Get the destination address */
948 case SIOCGIFNETMASK: /* Get the netmask for the interface */
949 /* Note that these ioctls will not sleep,
950 so that we do not impose a lock.
951 One day we will be forced to put shlock here (I mean SMP)
952 */
953 tryaddrmatch = (sin_orig.sin_family == AF_INET);
954 memset(sin, 0, sizeof(*sin));
955 sin->sin_family = AF_INET;
956 break;
957
958 case SIOCSIFFLAGS:
bf5b30b8 959 ret = -EPERM;
52e804c6 960 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 961 goto out;
962 break;
963 case SIOCSIFADDR: /* Set interface address (and family) */
964 case SIOCSIFBRDADDR: /* Set the broadcast address */
965 case SIOCSIFDSTADDR: /* Set the destination address */
966 case SIOCSIFNETMASK: /* Set the netmask for the interface */
bf5b30b8 967 ret = -EPERM;
52e804c6 968 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4
LT		 969 goto out;
970 ret = -EINVAL;
971 if (sin->sin_family != AF_INET)
972 goto out;
973 break;
974 default:
975 ret = -EINVAL;
976 goto out;
977 }
978
979 rtnl_lock();
980
981 ret = -ENODEV;
9f9354b9
ED		 982 dev = __dev_get_by_name(net, ifr.ifr_name);
983 if (!dev)
1da177e4
LT		 984 goto done;
985
986 if (colon)
987 *colon = ':';
988
9f9354b9
ED		 989 in_dev = __in_dev_get_rtnl(dev);
990 if (in_dev) {
1da177e4
LT		 991 if (tryaddrmatch) {
992 /* Matthias Andree */
993 /* compare label and address (4.4BSD style) */
994 /* note: we only do this for a limited set of ioctls
995 and only if the original address family was AF_INET.
996 This is checked above. */
997 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
998 ifap = &ifa->ifa_next) {
999 if (!strcmp(ifr.ifr_name, ifa->ifa_label) &&
1000 sin_orig.sin_addr.s_addr ==
6c91afe1 1001 ifa->ifa_local) {
1da177e4
LT		 1002 break; /* found */
1003 }
1004 }
1005 }
1006 /* we didn't get a match, maybe the application is
1007 4.3BSD-style and passed in junk so we fall back to
1008 comparing just the label */
1009 if (!ifa) {
1010 for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
1011 ifap = &ifa->ifa_next)
1012 if (!strcmp(ifr.ifr_name, ifa->ifa_label))
1013 break;
1014 }
1015 }
1016
1017 ret = -EADDRNOTAVAIL;
1018 if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1019 goto done;
1020
132adf54 1021 switch (cmd) {
1da177e4
LT		 1022 case SIOCGIFADDR: /* Get interface address */
1023 sin->sin_addr.s_addr = ifa->ifa_local;
1024 goto rarok;
1025
1026 case SIOCGIFBRDADDR: /* Get the broadcast address */
1027 sin->sin_addr.s_addr = ifa->ifa_broadcast;
1028 goto rarok;
1029
1030 case SIOCGIFDSTADDR: /* Get the destination address */
1031 sin->sin_addr.s_addr = ifa->ifa_address;
1032 goto rarok;
1033
1034 case SIOCGIFNETMASK: /* Get the netmask for the interface */
1035 sin->sin_addr.s_addr = ifa->ifa_mask;
1036 goto rarok;
1037
1038 case SIOCSIFFLAGS:
1039 if (colon) {
1040 ret = -EADDRNOTAVAIL;
1041 if (!ifa)
1042 break;
1043 ret = 0;
1044 if (!(ifr.ifr_flags & IFF_UP))
1045 inet_del_ifa(in_dev, ifap, 1);
1046 break;
1047 }
1048 ret = dev_change_flags(dev, ifr.ifr_flags);
1049 break;
1050
1051 case SIOCSIFADDR: /* Set interface address (and family) */
1052 ret = -EINVAL;
1053 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1054 break;
1055
1056 if (!ifa) {
1057 ret = -ENOBUFS;
9f9354b9
ED		 1058 ifa = inet_alloc_ifa();
1059 if (!ifa)
1da177e4 1060 break;
c7e2e1d7 1061 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1062 if (colon)
1063 memcpy(ifa->ifa_label, ifr.ifr_name, IFNAMSIZ);
1064 else
1065 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1066 } else {
1067 ret = 0;
1068 if (ifa->ifa_local == sin->sin_addr.s_addr)
1069 break;
1070 inet_del_ifa(in_dev, ifap, 0);
1071 ifa->ifa_broadcast = 0;
148f9729 1072 ifa->ifa_scope = 0;
1da177e4
LT		 1073 }
1074
1075 ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1076
1077 if (!(dev->flags & IFF_POINTOPOINT)) {
1078 ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1079 ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1080 if ((dev->flags & IFF_BROADCAST) &&
1081 ifa->ifa_prefixlen < 31)
1082 ifa->ifa_broadcast = ifa->ifa_address |
1083 ~ifa->ifa_mask;
1084 } else {
1085 ifa->ifa_prefixlen = 32;
1086 ifa->ifa_mask = inet_make_mask(32);
1087 }
5c766d64 1088 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 1089 ret = inet_set_ifa(dev, ifa);
1090 break;
1091
1092 case SIOCSIFBRDADDR: /* Set the broadcast address */
1093 ret = 0;
1094 if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1095 inet_del_ifa(in_dev, ifap, 0);
1096 ifa->ifa_broadcast = sin->sin_addr.s_addr;
1097 inet_insert_ifa(ifa);
1098 }
1099 break;
1100
1101 case SIOCSIFDSTADDR: /* Set the destination address */
1102 ret = 0;
1103 if (ifa->ifa_address == sin->sin_addr.s_addr)
1104 break;
1105 ret = -EINVAL;
1106 if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1107 break;
1108 ret = 0;
1109 inet_del_ifa(in_dev, ifap, 0);
1110 ifa->ifa_address = sin->sin_addr.s_addr;
1111 inet_insert_ifa(ifa);
1112 break;
1113
1114 case SIOCSIFNETMASK: /* Set the netmask for the interface */
1115
1116 /*
1117 * The mask we set must be legal.
1118 */
1119 ret = -EINVAL;
1120 if (bad_mask(sin->sin_addr.s_addr, 0))
1121 break;
1122 ret = 0;
1123 if (ifa->ifa_mask != sin->sin_addr.s_addr) {
a144ea4b 1124 __be32 old_mask = ifa->ifa_mask;
1da177e4
LT		 1125 inet_del_ifa(in_dev, ifap, 0);
1126 ifa->ifa_mask = sin->sin_addr.s_addr;
1127 ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1128
1129 /* See if current broadcast address matches
1130 * with current netmask, then recalculate
1131 * the broadcast address. Otherwise it's a
1132 * funny address, so don't touch it since
1133 * the user seems to know what (s)he's doing...
1134 */
1135 if ((dev->flags & IFF_BROADCAST) &&
1136 (ifa->ifa_prefixlen < 31) &&
1137 (ifa->ifa_broadcast ==
dcab5e1e 1138 (ifa->ifa_local|~old_mask))) {
1da177e4
LT		 1139 ifa->ifa_broadcast = (ifa->ifa_local |
1140 ~sin->sin_addr.s_addr);
1141 }
1142 inet_insert_ifa(ifa);
1143 }
1144 break;
1145 }
1146done:
1147 rtnl_unlock();
1148out:
1149 return ret;
1150rarok:
1151 rtnl_unlock();
1152 ret = copy_to_user(arg, &ifr, sizeof(struct ifreq)) ? -EFAULT : 0;
1153 goto out;
1154}
1155
1156static int inet_gifconf(struct net_device *dev, char __user *buf, int len)
1157{
e5ed6399 1158 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1159 struct in_ifaddr *ifa;
1160 struct ifreq ifr;
1161 int done = 0;
1162
9f9354b9 1163 if (!in_dev)
1da177e4
LT		 1164 goto out;
1165
9f9354b9 1166 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1da177e4
LT		 1167 if (!buf) {
1168 done += sizeof(ifr);
1169 continue;
1170 }
1171 if (len < (int) sizeof(ifr))
1172 break;
1173 memset(&ifr, 0, sizeof(struct ifreq));
4299c8a9 1174 strcpy(ifr.ifr_name, ifa->ifa_label);
1da177e4
LT		 1175
1176 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1177 (*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1178 ifa->ifa_local;
1179
1180 if (copy_to_user(buf, &ifr, sizeof(struct ifreq))) {
1181 done = -EFAULT;
1182 break;
1183 }
1184 buf += sizeof(struct ifreq);
1185 len -= sizeof(struct ifreq);
1186 done += sizeof(struct ifreq);
1187 }
1188out:
1189 return done;
1190}
1191
a61ced5d 1192__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1da177e4 1193{
a61ced5d 1194 __be32 addr = 0;
1da177e4 1195 struct in_device *in_dev;
c346dca1 1196 struct net *net = dev_net(dev);
1da177e4
LT		 1197
1198 rcu_read_lock();
e5ed6399 1199 in_dev = __in_dev_get_rcu(dev);
1da177e4
LT		 1200 if (!in_dev)
1201 goto no_in_dev;
1202
1203 for_primary_ifa(in_dev) {
1204 if (ifa->ifa_scope > scope)
1205 continue;
1206 if (!dst || inet_ifa_match(dst, ifa)) {
1207 addr = ifa->ifa_local;
1208 break;
1209 }
1210 if (!addr)
1211 addr = ifa->ifa_local;
1212 } endfor_ifa(in_dev);
1da177e4
LT		 1213
1214 if (addr)
c6d14c84 1215 goto out_unlock;
9f9354b9 1216no_in_dev:
1da177e4
LT		 1217
1218 /* Not loopback addresses on loopback should be preferred
ca9f1fd2 1219 in this case. It is important that lo is the first interface
1da177e4
LT		 1220 in dev_base list.
1221 */
c6d14c84 1222 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1223 in_dev = __in_dev_get_rcu(dev);
1224 if (!in_dev)
1da177e4
LT		 1225 continue;
1226
1227 for_primary_ifa(in_dev) {
1228 if (ifa->ifa_scope != RT_SCOPE_LINK &&
1229 ifa->ifa_scope <= scope) {
1230 addr = ifa->ifa_local;
c6d14c84 1231 goto out_unlock;
1da177e4
LT		 1232 }
1233 } endfor_ifa(in_dev);
1234 }
c6d14c84 1235out_unlock:
1da177e4 1236 rcu_read_unlock();
1da177e4
LT		 1237 return addr;
1238}
9f9354b9 1239EXPORT_SYMBOL(inet_select_addr);
1da177e4 1240
60cad5da
AV		 1241static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1242 __be32 local, int scope)
1da177e4
LT		 1243{
1244 int same = 0;
a144ea4b 1245 __be32 addr = 0;
1da177e4
LT		 1246
1247 for_ifa(in_dev) {
1248 if (!addr &&
1249 (local == ifa->ifa_local || !local) &&
1250 ifa->ifa_scope <= scope) {
1251 addr = ifa->ifa_local;
1252 if (same)
1253 break;
1254 }
1255 if (!same) {
1256 same = (!local || inet_ifa_match(local, ifa)) &&
1257 (!dst || inet_ifa_match(dst, ifa));
1258 if (same && addr) {
1259 if (local || !dst)
1260 break;
1261 /* Is the selected addr into dst subnet? */
1262 if (inet_ifa_match(addr, ifa))
1263 break;
1264 /* No, then can we use new local src? */
1265 if (ifa->ifa_scope <= scope) {
1266 addr = ifa->ifa_local;
1267 break;
1268 }
1269 /* search for large dst subnet for addr */
1270 same = 0;
1271 }
1272 }
1273 } endfor_ifa(in_dev);
1274
9f9354b9 1275 return same ? addr : 0;
1da177e4
LT		 1276}
1277
1278/*
1279 * Confirm that local IP address exists using wildcards:
b601fa19
ND		 1280 * - net: netns to check, cannot be NULL
1281 * - in_dev: only on this interface, NULL=any interface
1da177e4
LT		 1282 * - dst: only in the same subnet as dst, 0=any dst
1283 * - local: address, 0=autoselect the local address
1284 * - scope: maximum allowed scope value for the local address
1285 */
b601fa19 1286__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
9bd85e32 1287 __be32 dst, __be32 local, int scope)
1da177e4 1288{
60cad5da 1289 __be32 addr = 0;
9bd85e32 1290 struct net_device *dev;
1da177e4 1291
00db4124 1292 if (in_dev)
9bd85e32 1293 return confirm_addr_indev(in_dev, dst, local, scope);
1da177e4 1294
1da177e4 1295 rcu_read_lock();
c6d14c84 1296 for_each_netdev_rcu(net, dev) {
9f9354b9
ED		 1297 in_dev = __in_dev_get_rcu(dev);
1298 if (in_dev) {
1da177e4
LT		 1299 addr = confirm_addr_indev(in_dev, dst, local, scope);
1300 if (addr)
1301 break;
1302 }
1303 }
1304 rcu_read_unlock();
1da177e4
LT		 1305
1306 return addr;
1307}
eaddcd76 1308EXPORT_SYMBOL(inet_confirm_addr);
1da177e4
LT		 1309
1310/*
1311 * Device notifier
1312 */
1313
1314int register_inetaddr_notifier(struct notifier_block *nb)
1315{
e041c683 1316 return blocking_notifier_chain_register(&inetaddr_chain, nb);
1da177e4 1317}
9f9354b9 1318EXPORT_SYMBOL(register_inetaddr_notifier);
1da177e4
LT		 1319
1320int unregister_inetaddr_notifier(struct notifier_block *nb)
1321{
e041c683 1322 return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1da177e4 1323}
9f9354b9 1324EXPORT_SYMBOL(unregister_inetaddr_notifier);
1da177e4 1325
9f9354b9
ED		 1326/* Rename ifa_labels for a device name change. Make some effort to preserve
1327 * existing alias numbering and to create unique labels if possible.
1da177e4
LT		 1328*/
1329static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
e905a9ed 1330{
1da177e4
LT		 1331 struct in_ifaddr *ifa;
1332 int named = 0;
1333
e905a9ed
YH		 1334 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1335 char old[IFNAMSIZ], *dot;
1da177e4
LT		 1336
1337 memcpy(old, ifa->ifa_label, IFNAMSIZ);
e905a9ed 1338 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1da177e4 1339 if (named++ == 0)
573bf470 1340 goto skip;
44344b2a 1341 dot = strchr(old, ':');
51456b29 1342 if (!dot) {
e905a9ed 1343 sprintf(old, ":%d", named);
1da177e4
LT		 1344 dot = old;
1345 }
9f9354b9 1346 if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
e905a9ed 1347 strcat(ifa->ifa_label, dot);
9f9354b9 1348 else
e905a9ed 1349 strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
573bf470
TG		 1350skip:
1351 rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
e905a9ed
YH		 1352 }
1353}
1da177e4 1354
40384999 1355static bool inetdev_valid_mtu(unsigned int mtu)
06770843
BL		 1356{
1357 return mtu >= 68;
1358}
1359
d11327ad
IC		 1360static void inetdev_send_gratuitous_arp(struct net_device *dev,
1361 struct in_device *in_dev)
1362
1363{
b76d0789 1364 struct in_ifaddr *ifa;
d11327ad 1365
b76d0789
ZK		 1366 for (ifa = in_dev->ifa_list; ifa;
1367 ifa = ifa->ifa_next) {
1368 arp_send(ARPOP_REQUEST, ETH_P_ARP,
1369 ifa->ifa_local, dev,
1370 ifa->ifa_local, NULL,
1371 dev->dev_addr, NULL);
1372 }
d11327ad
IC		 1373}
1374
1da177e4
LT		 1375/* Called only under RTNL semaphore */
1376
1377static int inetdev_event(struct notifier_block *this, unsigned long event,
1378 void *ptr)
1379{
351638e7 1380 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
748e2d93 1381 struct in_device *in_dev = __in_dev_get_rtnl(dev);
0115e8e3 1382
1da177e4
LT		 1383 ASSERT_RTNL();
1384
1385 if (!in_dev) {
8030f544 1386 if (event == NETDEV_REGISTER) {
1da177e4 1387 in_dev = inetdev_init(dev);
20e61da7
WC		 1388 if (IS_ERR(in_dev))
1389 return notifier_from_errno(PTR_ERR(in_dev));
0cc217e1 1390 if (dev->flags & IFF_LOOPBACK) {
42f811b8
HX		 1391 IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1392 IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
8030f544 1393 }
06770843
BL		 1394 } else if (event == NETDEV_CHANGEMTU) {
1395 /* Re-enabling IP */
1396 if (inetdev_valid_mtu(dev->mtu))
1397 in_dev = inetdev_init(dev);
1da177e4
LT		 1398 }
1399 goto out;
1400 }
1401
1402 switch (event) {
1403 case NETDEV_REGISTER:
91df42be 1404 pr_debug("%s: bug\n", __func__);
a9b3cd7f 1405 RCU_INIT_POINTER(dev->ip_ptr, NULL);
1da177e4
LT		 1406 break;
1407 case NETDEV_UP:
06770843 1408 if (!inetdev_valid_mtu(dev->mtu))
1da177e4 1409 break;
0cc217e1 1410 if (dev->flags & IFF_LOOPBACK) {
9f9354b9
ED		 1411 struct in_ifaddr *ifa = inet_alloc_ifa();
1412
1413 if (ifa) {
fd23c3b3 1414 INIT_HLIST_NODE(&ifa->hash);
1da177e4
LT		 1415 ifa->ifa_local =
1416 ifa->ifa_address = htonl(INADDR_LOOPBACK);
1417 ifa->ifa_prefixlen = 8;
1418 ifa->ifa_mask = inet_make_mask(8);
1419 in_dev_hold(in_dev);
1420 ifa->ifa_dev = in_dev;
1421 ifa->ifa_scope = RT_SCOPE_HOST;
1422 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
5c766d64
JP		 1423 set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1424 INFINITY_LIFE_TIME);
dfd1582d
JP		 1425 ipv4_devconf_setall(in_dev);
1426 neigh_parms_data_state_setall(in_dev->arp_parms);
1da177e4
LT		 1427 inet_insert_ifa(ifa);
1428 }
1429 }
1430 ip_mc_up(in_dev);
eefef1cf
SH		 1431 /* fall through */
1432 case NETDEV_CHANGEADDR:
d11327ad
IC		 1433 if (!IN_DEV_ARP_NOTIFY(in_dev))
1434 break;
1435 /* fall through */
1436 case NETDEV_NOTIFY_PEERS:
a21090cf 1437 /* Send gratuitous ARP to notify of link change */
d11327ad 1438 inetdev_send_gratuitous_arp(dev, in_dev);
1da177e4
LT		 1439 break;
1440 case NETDEV_DOWN:
1441 ip_mc_down(in_dev);
1442 break;
93d9b7d7 1443 case NETDEV_PRE_TYPE_CHANGE:
75c78500
MS		 1444 ip_mc_unmap(in_dev);
1445 break;
93d9b7d7 1446 case NETDEV_POST_TYPE_CHANGE:
75c78500
MS		 1447 ip_mc_remap(in_dev);
1448 break;
1da177e4 1449 case NETDEV_CHANGEMTU:
06770843 1450 if (inetdev_valid_mtu(dev->mtu))
1da177e4 1451 break;
06770843 1452 /* disable IP when MTU is not enough */
1da177e4
LT		 1453 case NETDEV_UNREGISTER:
1454 inetdev_destroy(in_dev);
1455 break;
1456 case NETDEV_CHANGENAME:
1457 /* Do not notify about label change, this event is
1458 * not interesting to applications using netlink.
1459 */
1460 inetdev_changename(dev, in_dev);
1461
51602b2a 1462 devinet_sysctl_unregister(in_dev);
66f27a52 1463 devinet_sysctl_register(in_dev);
1da177e4
LT		 1464 break;
1465 }
1466out:
1467 return NOTIFY_DONE;
1468}
1469
1470static struct notifier_block ip_netdev_notifier = {
539afedf 1471 .notifier_call = inetdev_event,
1da177e4
LT		 1472};
1473
40384999 1474static size_t inet_nlmsg_size(void)
339bf98f
TG		 1475{
1476 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1477 + nla_total_size(4) /* IFA_ADDRESS */
1478 + nla_total_size(4) /* IFA_LOCAL */
1479 + nla_total_size(4) /* IFA_BROADCAST */
ad6c8135 1480 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
63b5f152
GU		 1481 + nla_total_size(4) /* IFA_FLAGS */
1482 + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
339bf98f
TG		 1483}
1484
5c766d64
JP		 1485static inline u32 cstamp_delta(unsigned long cstamp)
1486{
1487 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1488}
1489
1490static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1491 unsigned long tstamp, u32 preferred, u32 valid)
1492{
1493 struct ifa_cacheinfo ci;
1494
1495 ci.cstamp = cstamp_delta(cstamp);
1496 ci.tstamp = cstamp_delta(tstamp);
1497 ci.ifa_prefered = preferred;
1498 ci.ifa_valid = valid;
1499
1500 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1501}
1502
1da177e4 1503static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
15e47304 1504 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 1505{
1506 struct ifaddrmsg *ifm;
1507 struct nlmsghdr *nlh;
5c766d64 1508 u32 preferred, valid;
1da177e4 1509
15e47304 1510 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
51456b29 1511 if (!nlh)
26932566 1512 return -EMSGSIZE;
47f68512
TG		 1513
1514 ifm = nlmsg_data(nlh);
1da177e4
LT		 1515 ifm->ifa_family = AF_INET;
1516 ifm->ifa_prefixlen = ifa->ifa_prefixlen;
5c766d64 1517 ifm->ifa_flags = ifa->ifa_flags;
1da177e4
LT		 1518 ifm->ifa_scope = ifa->ifa_scope;
1519 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
47f68512 1520
5c766d64
JP		 1521 if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1522 preferred = ifa->ifa_preferred_lft;
1523 valid = ifa->ifa_valid_lft;
1524 if (preferred != INFINITY_LIFE_TIME) {
1525 long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1526
1527 if (preferred > tval)
1528 preferred -= tval;
1529 else
1530 preferred = 0;
1531 if (valid != INFINITY_LIFE_TIME) {
1532 if (valid > tval)
1533 valid -= tval;
1534 else
1535 valid = 0;
1536 }
1537 }
1538 } else {
1539 preferred = INFINITY_LIFE_TIME;
1540 valid = INFINITY_LIFE_TIME;
1541 }
f3756b79 1542 if ((ifa->ifa_address &&
930345ea 1543 nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
f3756b79 1544 (ifa->ifa_local &&
930345ea 1545 nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
f3756b79 1546 (ifa->ifa_broadcast &&
930345ea 1547 nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
f3756b79 1548 (ifa->ifa_label[0] &&
5c766d64 1549 nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
ad6c8135 1550 nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
5c766d64
JP		 1551 put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1552 preferred, valid))
f3756b79 1553 goto nla_put_failure;
1da177e4 1554
053c095a
JB		 1555 nlmsg_end(skb, nlh);
1556 return 0;
47f68512
TG		 1557
1558nla_put_failure:
26932566
PM		 1559 nlmsg_cancel(skb, nlh);
1560 return -EMSGSIZE;
1da177e4
LT		 1561}
1562
1563static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1564{
3b1e0a65 1565 struct net *net = sock_net(skb->sk);
eec4df98
ED		 1566 int h, s_h;
1567 int idx, s_idx;
1568 int ip_idx, s_ip_idx;
1da177e4
LT		 1569 struct net_device *dev;
1570 struct in_device *in_dev;
1571 struct in_ifaddr *ifa;
eec4df98 1572 struct hlist_head *head;
1da177e4 1573
eec4df98
ED		 1574 s_h = cb->args[0];
1575 s_idx = idx = cb->args[1];
1576 s_ip_idx = ip_idx = cb->args[2];
1577
1578 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1579 idx = 0;
1580 head = &net->dev_index_head[h];
1581 rcu_read_lock();
0465277f
ND		 1582 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1583 net->dev_base_seq;
b67bfe0d 1584 hlist_for_each_entry_rcu(dev, head, index_hlist) {
eec4df98
ED		 1585 if (idx < s_idx)
1586 goto cont;
4b97efdf 1587 if (h > s_h || idx > s_idx)
eec4df98
ED		 1588 s_ip_idx = 0;
1589 in_dev = __in_dev_get_rcu(dev);
1590 if (!in_dev)
1591 goto cont;
1da177e4 1592
eec4df98
ED		 1593 for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1594 ifa = ifa->ifa_next, ip_idx++) {
1595 if (ip_idx < s_ip_idx)
1596 continue;
1597 if (inet_fill_ifaddr(skb, ifa,
15e47304 1598 NETLINK_CB(cb->skb).portid,
1da177e4 1599 cb->nlh->nlmsg_seq,
053c095a 1600 RTM_NEWADDR, NLM_F_MULTI) < 0) {
eec4df98
ED		 1601 rcu_read_unlock();
1602 goto done;
1603 }
0465277f 1604 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
eec4df98 1605 }
7562f876 1606cont:
eec4df98
ED		 1607 idx++;
1608 }
1609 rcu_read_unlock();
1da177e4
LT		 1610 }
1611
1612done:
eec4df98
ED		 1613 cb->args[0] = h;
1614 cb->args[1] = idx;
1615 cb->args[2] = ip_idx;
1da177e4
LT		 1616
1617 return skb->len;
1618}
1619
539afedf 1620static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
15e47304 1621 u32 portid)
1da177e4 1622{
47f68512 1623 struct sk_buff *skb;
d6062cbb
TG		 1624 u32 seq = nlh ? nlh->nlmsg_seq : 0;
1625 int err = -ENOBUFS;
4b8aa9ab 1626 struct net *net;
1da177e4 1627
c346dca1 1628 net = dev_net(ifa->ifa_dev->dev);
339bf98f 1629 skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
51456b29 1630 if (!skb)
d6062cbb
TG		 1631 goto errout;
1632
15e47304 1633 err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
26932566
PM		 1634 if (err < 0) {
1635 /* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1636 WARN_ON(err == -EMSGSIZE);
1637 kfree_skb(skb);
1638 goto errout;
1639 }
15e47304 1640 rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1ce85fe4 1641 return;
d6062cbb
TG		 1642errout:
1643 if (err < 0)
4b8aa9ab 1644 rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1da177e4
LT		 1645}
1646
b1974ed0
AR		 1647static size_t inet_get_link_af_size(const struct net_device *dev,
1648 u32 ext_filter_mask)
9f0f7272 1649{
1fc19aff 1650 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1651
1652 if (!in_dev)
1653 return 0;
1654
1655 return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1656}
1657
d5566fd7
SV		 1658static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1659 u32 ext_filter_mask)
9f0f7272 1660{
1fc19aff 1661 struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
9f0f7272
TG		 1662 struct nlattr *nla;
1663 int i;
1664
1665 if (!in_dev)
1666 return -ENODATA;
1667
1668 nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
51456b29 1669 if (!nla)
9f0f7272
TG		 1670 return -EMSGSIZE;
1671
1672 for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1673 ((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1674
1675 return 0;
1676}
1677
1678static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1679 [IFLA_INET_CONF] = { .type = NLA_NESTED },
1680};
1681
cf7afbfe
TG		 1682static int inet_validate_link_af(const struct net_device *dev,
1683 const struct nlattr *nla)
9f0f7272 1684{
9f0f7272
TG		 1685 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1686 int err, rem;
1687
f7fce74e 1688 if (dev && !__in_dev_get_rtnl(dev))
cf7afbfe 1689 return -EAFNOSUPPORT;
9f0f7272
TG		 1690
1691 err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
1692 if (err < 0)
1693 return err;
1694
1695 if (tb[IFLA_INET_CONF]) {
1696 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1697 int cfgid = nla_type(a);
1698
1699 if (nla_len(a) < 4)
1700 return -EINVAL;
1701
1702 if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1703 return -EINVAL;
1704 }
1705 }
1706
cf7afbfe
TG		 1707 return 0;
1708}
1709
1710static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1711{
f7fce74e 1712 struct in_device *in_dev = __in_dev_get_rtnl(dev);
cf7afbfe
TG		 1713 struct nlattr *a, *tb[IFLA_INET_MAX+1];
1714 int rem;
1715
1716 if (!in_dev)
1717 return -EAFNOSUPPORT;
1718
1719 if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL) < 0)
1720 BUG();
1721
9f0f7272
TG		 1722 if (tb[IFLA_INET_CONF]) {
1723 nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1724 ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1725 }
1726
1727 return 0;
1728}
1729
edc9e748
ND		 1730static int inet_netconf_msgsize_devconf(int type)
1731{
1732 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1733 + nla_total_size(4); /* NETCONFA_IFINDEX */
1734
9e551110
ND		 1735 /* type -1 is used for ALL */
1736 if (type == -1 || type == NETCONFA_FORWARDING)
edc9e748 1737 size += nla_total_size(4);
cc535dfb
ND		 1738 if (type == -1 || type == NETCONFA_RP_FILTER)
1739 size += nla_total_size(4);
d67b8c61
ND		 1740 if (type == -1 || type == NETCONFA_MC_FORWARDING)
1741 size += nla_total_size(4);
09aea5df 1742 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
f085ff1c 1743 size += nla_total_size(4);
974d7af5
AG		 1744 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
1745 size += nla_total_size(4);
edc9e748
ND		 1746
1747 return size;
1748}
1749
1750static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1751 struct ipv4_devconf *devconf, u32 portid,
1752 u32 seq, int event, unsigned int flags,
1753 int type)
1754{
1755 struct nlmsghdr *nlh;
1756 struct netconfmsg *ncm;
1757
1758 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1759 flags);
51456b29 1760 if (!nlh)
edc9e748
ND		 1761 return -EMSGSIZE;
1762
1763 ncm = nlmsg_data(nlh);
1764 ncm->ncm_family = AF_INET;
1765
1766 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1767 goto nla_put_failure;
1768
9e551110
ND		 1769 /* type -1 is used for ALL */
1770 if ((type == -1 || type == NETCONFA_FORWARDING) &&
edc9e748
ND		 1771 nla_put_s32(skb, NETCONFA_FORWARDING,
1772 IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1773 goto nla_put_failure;
cc535dfb
ND		 1774 if ((type == -1 || type == NETCONFA_RP_FILTER) &&
1775 nla_put_s32(skb, NETCONFA_RP_FILTER,
1776 IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1777 goto nla_put_failure;
d67b8c61
ND		 1778 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
1779 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1780 IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1781 goto nla_put_failure;
09aea5df 1782 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
1783 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
f085ff1c 1784 IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1785 goto nla_put_failure;
974d7af5
AG		 1786 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
1787 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
1788 IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
1789 goto nla_put_failure;
edc9e748 1790
053c095a
JB		 1791 nlmsg_end(skb, nlh);
1792 return 0;
edc9e748
ND		 1793
1794nla_put_failure:
1795 nlmsg_cancel(skb, nlh);
1796 return -EMSGSIZE;
1797}
1798
d67b8c61
ND		 1799void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
1800 struct ipv4_devconf *devconf)
edc9e748
ND		 1801{
1802 struct sk_buff *skb;
1803 int err = -ENOBUFS;
1804
1805 skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_ATOMIC);
51456b29 1806 if (!skb)
edc9e748
ND		 1807 goto errout;
1808
1809 err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1810 RTM_NEWNETCONF, 0, type);
1811 if (err < 0) {
1812 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1813 WARN_ON(err == -EMSGSIZE);
1814 kfree_skb(skb);
1815 goto errout;
1816 }
1817 rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_ATOMIC);
1818 return;
1819errout:
1820 if (err < 0)
1821 rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1822}
1823
9e551110
ND		 1824static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1825 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
1826 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
cc535dfb 1827 [NETCONFA_RP_FILTER] = { .len = sizeof(int) },
09aea5df 1828 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
974d7af5 1829 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
9e551110
ND		 1830};
1831
1832static int inet_netconf_get_devconf(struct sk_buff *in_skb,
661d2967 1833 struct nlmsghdr *nlh)
9e551110
ND		 1834{
1835 struct net *net = sock_net(in_skb->sk);
1836 struct nlattr *tb[NETCONFA_MAX+1];
1837 struct netconfmsg *ncm;
1838 struct sk_buff *skb;
1839 struct ipv4_devconf *devconf;
1840 struct in_device *in_dev;
1841 struct net_device *dev;
1842 int ifindex;
1843 int err;
1844
1845 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1846 devconf_ipv4_policy);
1847 if (err < 0)
1848 goto errout;
1849
1850 err = EINVAL;
1851 if (!tb[NETCONFA_IFINDEX])
1852 goto errout;
1853
1854 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1855 switch (ifindex) {
1856 case NETCONFA_IFINDEX_ALL:
1857 devconf = net->ipv4.devconf_all;
1858 break;
1859 case NETCONFA_IFINDEX_DEFAULT:
1860 devconf = net->ipv4.devconf_dflt;
1861 break;
1862 default:
1863 dev = __dev_get_by_index(net, ifindex);
51456b29 1864 if (!dev)
9e551110
ND		 1865 goto errout;
1866 in_dev = __in_dev_get_rtnl(dev);
51456b29 1867 if (!in_dev)
9e551110
ND		 1868 goto errout;
1869 devconf = &in_dev->cnf;
1870 break;
1871 }
1872
1873 err = -ENOBUFS;
1874 skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);
51456b29 1875 if (!skb)
9e551110
ND		 1876 goto errout;
1877
1878 err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1879 NETLINK_CB(in_skb).portid,
1880 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1881 -1);
1882 if (err < 0) {
1883 /* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1884 WARN_ON(err == -EMSGSIZE);
1885 kfree_skb(skb);
1886 goto errout;
1887 }
1888 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1889errout:
1890 return err;
1891}
1892
7a674200
ND		 1893static int inet_netconf_dump_devconf(struct sk_buff *skb,
1894 struct netlink_callback *cb)
1895{
1896 struct net *net = sock_net(skb->sk);
1897 int h, s_h;
1898 int idx, s_idx;
1899 struct net_device *dev;
1900 struct in_device *in_dev;
1901 struct hlist_head *head;
1902
1903 s_h = cb->args[0];
1904 s_idx = idx = cb->args[1];
1905
1906 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1907 idx = 0;
1908 head = &net->dev_index_head[h];
1909 rcu_read_lock();
0465277f
ND		 1910 cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1911 net->dev_base_seq;
7a674200
ND		 1912 hlist_for_each_entry_rcu(dev, head, index_hlist) {
1913 if (idx < s_idx)
1914 goto cont;
1915 in_dev = __in_dev_get_rcu(dev);
1916 if (!in_dev)
1917 goto cont;
1918
1919 if (inet_netconf_fill_devconf(skb, dev->ifindex,
1920 &in_dev->cnf,
1921 NETLINK_CB(cb->skb).portid,
1922 cb->nlh->nlmsg_seq,
1923 RTM_NEWNETCONF,
1924 NLM_F_MULTI,
7b46a644 1925 -1) < 0) {
7a674200
ND		 1926 rcu_read_unlock();
1927 goto done;
1928 }
0465277f 1929 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7a674200
ND		 1930cont:
1931 idx++;
1932 }
1933 rcu_read_unlock();
1934 }
1935 if (h == NETDEV_HASHENTRIES) {
1936 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
1937 net->ipv4.devconf_all,
1938 NETLINK_CB(cb->skb).portid,
1939 cb->nlh->nlmsg_seq,
1940 RTM_NEWNETCONF, NLM_F_MULTI,
7b46a644 1941 -1) < 0)
7a674200
ND		 1942 goto done;
1943 else
1944 h++;
1945 }
1946 if (h == NETDEV_HASHENTRIES + 1) {
1947 if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
1948 net->ipv4.devconf_dflt,
1949 NETLINK_CB(cb->skb).portid,
1950 cb->nlh->nlmsg_seq,
1951 RTM_NEWNETCONF, NLM_F_MULTI,
7b46a644 1952 -1) < 0)
7a674200
ND		 1953 goto done;
1954 else
1955 h++;
1956 }
1957done:
1958 cb->args[0] = h;
1959 cb->args[1] = idx;
1960
1961 return skb->len;
1962}
1963
1da177e4
LT		 1964#ifdef CONFIG_SYSCTL
1965
c0ce9fb3 1966static void devinet_copy_dflt_conf(struct net *net, int i)
31be3085
HX		 1967{
1968 struct net_device *dev;
1969
c6d14c84
ED		 1970 rcu_read_lock();
1971 for_each_netdev_rcu(net, dev) {
31be3085 1972 struct in_device *in_dev;
c6d14c84 1973
31be3085
HX		 1974 in_dev = __in_dev_get_rcu(dev);
1975 if (in_dev && !test_bit(i, in_dev->cnf.state))
9355bbd6 1976 in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
31be3085 1977 }
c6d14c84 1978 rcu_read_unlock();
31be3085
HX		 1979}
1980
c6d14c84 1981/* called with RTNL locked */
c0ce9fb3 1982static void inet_forward_change(struct net *net)
68dd299b
PE		 1983{
1984 struct net_device *dev;
586f1211 1985 int on = IPV4_DEVCONF_ALL(net, FORWARDING);
68dd299b 1986
586f1211 1987 IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
9355bbd6 1988 IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
edc9e748
ND		 1989 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1990 NETCONFA_IFINDEX_ALL,
1991 net->ipv4.devconf_all);
1992 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
1993 NETCONFA_IFINDEX_DEFAULT,
1994 net->ipv4.devconf_dflt);
68dd299b 1995
c0ce9fb3 1996 for_each_netdev(net, dev) {
68dd299b 1997 struct in_device *in_dev;
0187bdfb
BH		 1998 if (on)
1999 dev_disable_lro(dev);
68dd299b
PE		 2000 rcu_read_lock();
2001 in_dev = __in_dev_get_rcu(dev);
edc9e748 2002 if (in_dev) {
68dd299b 2003 IN_DEV_CONF_SET(in_dev, FORWARDING, on);
edc9e748
ND		 2004 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2005 dev->ifindex, &in_dev->cnf);
2006 }
68dd299b
PE		 2007 rcu_read_unlock();
2008 }
68dd299b
PE		 2009}
2010
f085ff1c 2011static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2012{
2013 if (cnf == net->ipv4.devconf_dflt)
2014 return NETCONFA_IFINDEX_DEFAULT;
2015 else if (cnf == net->ipv4.devconf_all)
2016 return NETCONFA_IFINDEX_ALL;
2017 else {
2018 struct in_device *idev
2019 = container_of(cnf, struct in_device, cnf);
2020 return idev->dev->ifindex;
2021 }
2022}
2023
fe2c6338 2024static int devinet_conf_proc(struct ctl_table *ctl, int write,
8d65af78 2025 void __user *buffer,
31be3085
HX		 2026 size_t *lenp, loff_t *ppos)
2027{
d01ff0a0 2028 int old_value = *(int *)ctl->data;
8d65af78 2029 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
d01ff0a0 2030 int new_value = *(int *)ctl->data;
31be3085
HX		 2031
2032 if (write) {
2033 struct ipv4_devconf *cnf = ctl->extra1;
c0ce9fb3 2034 struct net *net = ctl->extra2;
31be3085 2035 int i = (int *)ctl->data - cnf->data;
f085ff1c 2036 int ifindex;
31be3085
HX		 2037
2038 set_bit(i, cnf->state);
2039
9355bbd6 2040 if (cnf == net->ipv4.devconf_dflt)
c0ce9fb3 2041 devinet_copy_dflt_conf(net, i);
d0daebc3
TG		 2042 if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2043 i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
d01ff0a0 2044 if ((new_value == 0) && (old_value != 0))
4ccfe6d4 2045 rt_cache_flush(net);
f085ff1c 2046
cc535dfb
ND		 2047 if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2048 new_value != old_value) {
f085ff1c 2049 ifindex = devinet_conf_ifindex(net, cnf);
cc535dfb
ND		 2050 inet_netconf_notify_devconf(net, NETCONFA_RP_FILTER,
2051 ifindex, cnf);
2052 }
f085ff1c 2053 if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2054 new_value != old_value) {
2055 ifindex = devinet_conf_ifindex(net, cnf);
09aea5df 2056 inet_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
f085ff1c 2057 ifindex, cnf);
2058 }
974d7af5
AG		 2059 if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2060 new_value != old_value) {
2061 ifindex = devinet_conf_ifindex(net, cnf);
2062 inet_netconf_notify_devconf(net, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2063 ifindex, cnf);
2064 }
31be3085
HX		 2065 }
2066
2067 return ret;
2068}
2069
fe2c6338 2070static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
8d65af78 2071 void __user *buffer,
1da177e4
LT		 2072 size_t *lenp, loff_t *ppos)
2073{
2074 int *valp = ctl->data;
2075 int val = *valp;
88af182e 2076 loff_t pos = *ppos;
8d65af78 2077 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4
LT		 2078
2079 if (write && *valp != val) {
c0ce9fb3
PE		 2080 struct net *net = ctl->extra2;
2081
0187bdfb 2082 if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
88af182e
EB		 2083 if (!rtnl_trylock()) {
2084 /* Restore the original values before restarting */
2085 *valp = val;
2086 *ppos = pos;
9b8adb5e 2087 return restart_syscall();
88af182e 2088 }
0187bdfb
BH		 2089 if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2090 inet_forward_change(net);
edc9e748 2091 } else {
0187bdfb
BH		 2092 struct ipv4_devconf *cnf = ctl->extra1;
2093 struct in_device *idev =
2094 container_of(cnf, struct in_device, cnf);
edc9e748
ND		 2095 if (*valp)
2096 dev_disable_lro(idev->dev);
2097 inet_netconf_notify_devconf(net,
2098 NETCONFA_FORWARDING,
2099 idev->dev->ifindex,
2100 cnf);
0187bdfb
BH		 2101 }
2102 rtnl_unlock();
4ccfe6d4 2103 rt_cache_flush(net);
edc9e748
ND		 2104 } else
2105 inet_netconf_notify_devconf(net, NETCONFA_FORWARDING,
2106 NETCONFA_IFINDEX_DEFAULT,
2107 net->ipv4.devconf_dflt);
1da177e4
LT		 2108 }
2109
2110 return ret;
2111}
2112
fe2c6338 2113static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
323e126f
DM		 2114 void __user *buffer,
2115 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2116{
2117 int *valp = ctl->data;
2118 int val = *valp;
8d65af78 2119 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
76e6ebfb 2120 struct net *net = ctl->extra2;
1da177e4
LT		 2121
2122 if (write && *valp != val)
4ccfe6d4 2123 rt_cache_flush(net);
1da177e4
LT		 2124
2125 return ret;
2126}
2127
f8572d8f 2128#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
42f811b8 2129 { \
42f811b8
HX		 2130 .procname = name, \
2131 .data = ipv4_devconf.data + \
02291680 2132 IPV4_DEVCONF_ ## attr - 1, \
42f811b8
HX		 2133 .maxlen = sizeof(int), \
2134 .mode = mval, \
2135 .proc_handler = proc, \
31be3085 2136 .extra1 = &ipv4_devconf, \
42f811b8
HX		 2137 }
2138
2139#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
f8572d8f 2140 DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
42f811b8
HX		 2141
2142#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
f8572d8f 2143 DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
42f811b8 2144
f8572d8f
EB		 2145#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2146 DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
42f811b8
HX		 2147
2148#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
f8572d8f 2149 DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
42f811b8 2150
1da177e4
LT		 2151static struct devinet_sysctl_table {
2152 struct ctl_table_header *sysctl_header;
02291680 2153 struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
1da177e4
LT		 2154} devinet_sysctl = {
2155 .devinet_vars = {
42f811b8 2156 DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
f8572d8f 2157 devinet_sysctl_forward),
42f811b8
HX		 2158 DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2159
2160 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2161 DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2162 DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2163 DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2164 DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2165 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2166 "accept_source_route"),
8153a10c 2167 DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
28f6aeea 2168 DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
42f811b8
HX		 2169 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2170 DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2171 DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2172 DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2173 DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2174 DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2175 DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2176 DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2177 DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
eefef1cf 2178 DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
65324144 2179 DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
5c6fe01c
WM		 2180 DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2181 "force_igmp_version"),
2690048c
WM		 2182 DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2183 "igmpv2_unsolicited_report_interval"),
2184 DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2185 "igmpv3_unsolicited_report_interval"),
0eeb075f
AG		 2186 DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2187 "ignore_routes_with_linkdown"),
42f811b8
HX		 2188
2189 DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2190 DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
42f811b8
HX		 2191 DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2192 "promote_secondaries"),
d0daebc3
TG		 2193 DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2194 "route_localnet"),
1da177e4 2195 },
1da177e4
LT		 2196};
2197
ea40b324 2198static int __devinet_sysctl_register(struct net *net, char *dev_name,
f8572d8f 2199 struct ipv4_devconf *p)
1da177e4
LT		 2200{
2201 int i;
9fa89642 2202 struct devinet_sysctl_table *t;
8607ddb8 2203 char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
bfada697 2204
9fa89642 2205 t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 2206 if (!t)
9fa89642
PE		 2207 goto out;
2208
1da177e4
LT		 2209 for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2210 t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
31be3085 2211 t->devinet_vars[i].extra1 = p;
c0ce9fb3 2212 t->devinet_vars[i].extra2 = net;
1da177e4
LT		 2213 }
2214
8607ddb8 2215 snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
1da177e4 2216
8607ddb8 2217 t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
1da177e4 2218 if (!t->sysctl_header)
8607ddb8 2219 goto free;
1da177e4
LT		 2220
2221 p->sysctl = t;
ea40b324 2222 return 0;
1da177e4 2223
9fa89642 2224free:
1da177e4 2225 kfree(t);
9fa89642 2226out:
ea40b324 2227 return -ENOBUFS;
1da177e4
LT		 2228}
2229
51602b2a
PE		 2230static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
2231{
2232 struct devinet_sysctl_table *t = cnf->sysctl;
2233
51456b29 2234 if (!t)
51602b2a
PE		 2235 return;
2236
2237 cnf->sysctl = NULL;
ff538818 2238 unregister_net_sysctl_table(t->sysctl_header);
51602b2a
PE		 2239 kfree(t);
2240}
2241
20e61da7 2242static int devinet_sysctl_register(struct in_device *idev)
66f27a52 2243{
20e61da7
WC		 2244 int err;
2245
2246 if (!sysctl_dev_name_is_allowed(idev->dev->name))
2247 return -EINVAL;
2248
2249 err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2250 if (err)
2251 return err;
2252 err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 2253 &idev->cnf);
20e61da7
WC		 2254 if (err)
2255 neigh_sysctl_unregister(idev->arp_parms);
2256 return err;
66f27a52
PE		 2257}
2258
51602b2a 2259static void devinet_sysctl_unregister(struct in_device *idev)
1da177e4 2260{
51602b2a
PE		 2261 __devinet_sysctl_unregister(&idev->cnf);
2262 neigh_sysctl_unregister(idev->arp_parms);
1da177e4 2263}
1da177e4 2264
68dd299b
PE		 2265static struct ctl_table ctl_forward_entry[] = {
2266 {
68dd299b
PE		 2267 .procname = "ip_forward",
2268 .data = &ipv4_devconf.data[
02291680 2269 IPV4_DEVCONF_FORWARDING - 1],
68dd299b
PE		 2270 .maxlen = sizeof(int),
2271 .mode = 0644,
2272 .proc_handler = devinet_sysctl_forward,
68dd299b 2273 .extra1 = &ipv4_devconf,
c0ce9fb3 2274 .extra2 = &init_net,
68dd299b
PE		 2275 },
2276 { },
2277};
2a75de0c 2278#endif
68dd299b 2279
752d14dc
PE		 2280static __net_init int devinet_init_net(struct net *net)
2281{
2282 int err;
752d14dc 2283 struct ipv4_devconf *all, *dflt;
2a75de0c
ED		 2284#ifdef CONFIG_SYSCTL
2285 struct ctl_table *tbl = ctl_forward_entry;
752d14dc 2286 struct ctl_table_header *forw_hdr;
2a75de0c 2287#endif
752d14dc
PE		 2288
2289 err = -ENOMEM;
2290 all = &ipv4_devconf;
2291 dflt = &ipv4_devconf_dflt;
752d14dc 2292
09ad9bc7 2293 if (!net_eq(net, &init_net)) {
752d14dc 2294 all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
51456b29 2295 if (!all)
752d14dc
PE		 2296 goto err_alloc_all;
2297
2298 dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
51456b29 2299 if (!dflt)
752d14dc
PE		 2300 goto err_alloc_dflt;
2301
2a75de0c 2302#ifdef CONFIG_SYSCTL
752d14dc 2303 tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
51456b29 2304 if (!tbl)
752d14dc
PE		 2305 goto err_alloc_ctl;
2306
02291680 2307 tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
752d14dc
PE		 2308 tbl[0].extra1 = all;
2309 tbl[0].extra2 = net;
2a75de0c 2310#endif
752d14dc
PE		 2311 }
2312
2313#ifdef CONFIG_SYSCTL
f8572d8f 2314 err = __devinet_sysctl_register(net, "all", all);
752d14dc
PE		 2315 if (err < 0)
2316 goto err_reg_all;
2317
f8572d8f 2318 err = __devinet_sysctl_register(net, "default", dflt);
752d14dc
PE		 2319 if (err < 0)
2320 goto err_reg_dflt;
2321
2322 err = -ENOMEM;
8607ddb8 2323 forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
51456b29 2324 if (!forw_hdr)
752d14dc 2325 goto err_reg_ctl;
2a75de0c 2326 net->ipv4.forw_hdr = forw_hdr;
752d14dc
PE		 2327#endif
2328
752d14dc
PE		 2329 net->ipv4.devconf_all = all;
2330 net->ipv4.devconf_dflt = dflt;
2331 return 0;
2332
2333#ifdef CONFIG_SYSCTL
2334err_reg_ctl:
2335 __devinet_sysctl_unregister(dflt);
2336err_reg_dflt:
2337 __devinet_sysctl_unregister(all);
2338err_reg_all:
2339 if (tbl != ctl_forward_entry)
2340 kfree(tbl);
752d14dc 2341err_alloc_ctl:
2a75de0c 2342#endif
752d14dc
PE		 2343 if (dflt != &ipv4_devconf_dflt)
2344 kfree(dflt);
2345err_alloc_dflt:
2346 if (all != &ipv4_devconf)
2347 kfree(all);
2348err_alloc_all:
2349 return err;
2350}
2351
2352static __net_exit void devinet_exit_net(struct net *net)
2353{
2a75de0c 2354#ifdef CONFIG_SYSCTL
752d14dc
PE		 2355 struct ctl_table *tbl;
2356
2357 tbl = net->ipv4.forw_hdr->ctl_table_arg;
752d14dc
PE		 2358 unregister_net_sysctl_table(net->ipv4.forw_hdr);
2359 __devinet_sysctl_unregister(net->ipv4.devconf_dflt);
2360 __devinet_sysctl_unregister(net->ipv4.devconf_all);
752d14dc 2361 kfree(tbl);
2a75de0c 2362#endif
752d14dc
PE		 2363 kfree(net->ipv4.devconf_dflt);
2364 kfree(net->ipv4.devconf_all);
2365}
2366
2367static __net_initdata struct pernet_operations devinet_ops = {
2368 .init = devinet_init_net,
2369 .exit = devinet_exit_net,
2370};
2371
207895fd 2372static struct rtnl_af_ops inet_af_ops __read_mostly = {
9f0f7272
TG		 2373 .family = AF_INET,
2374 .fill_link_af = inet_fill_link_af,
2375 .get_link_af_size = inet_get_link_af_size,
cf7afbfe
TG		 2376 .validate_link_af = inet_validate_link_af,
2377 .set_link_af = inet_set_link_af,
9f0f7272
TG		 2378};
2379
1da177e4
LT		 2380void __init devinet_init(void)
2381{
fd23c3b3
DM		 2382 int i;
2383
2384 for (i = 0; i < IN4_ADDR_HSIZE; i++)
2385 INIT_HLIST_HEAD(&inet_addr_lst[i]);
2386
752d14dc
PE		 2387 register_pernet_subsys(&devinet_ops);
2388
1da177e4
LT		 2389 register_gifconf(PF_INET, inet_gifconf);
2390 register_netdevice_notifier(&ip_netdev_notifier);
63f3444f 2391
906e073f 2392 queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
5c766d64 2393
9f0f7272
TG		 2394 rtnl_af_register(&inet_af_ops);
2395
c7ac8679
GR		 2396 rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);
2397 rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);
2398 rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);
9e551110 2399 rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
7a674200 2400 inet_netconf_dump_devconf, NULL);
1da177e4 2401}
Linux kernel - Deliverables
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